The phrase "necessary corollary" refers to something that must happen or exist as a natural consequence or result of something else. It is an essential part or a logical conclusion that goes along with the main idea or concept. Full definition
International institutions have been seen as necessary corollary to domestic jurisdiction in specific circumstances. (ejiltalk.org)
Holloway's assertion that Jesus Christ is the master - key to the universe has a necessary corollary concerning the relation of every aspect of reality to Christ. (faith.org.uk)
If «deeply felt personal experience» is sufficient proof of a claim, then's let's accept that, along with the necessary corollary that all such experiences must be equally valid, such as the gentleman in the asylum who deeply feels he is Napoleon. (nakedpastor.com)